Pipe-coupling.



lC. R. SCHMIDTw PIPE coUPLiNG. APPLICATION FILED 00T.22,1907.

2 SHEETS-SHEET 1.

0. vR. SCHMIDT.

PIPE GOUPLING.

APPLICATION FILED 00T. 22, 1907.

Patented Jan. 5, 1909.

2 SHEETS-SHEET 2.

"u ARLES R. SCHMIDT, OF BALTIMORE. ltlARYLAND.

PIPECOUPLING.

Specification of Letters Patent.

Patented. Jen. 51, 1909 appnmnimV me@ acum ze, 19m. semi no. scanso.

To all whom it may concern: i

lle it known that' l. CHARLES R. SoHMin'r, a citizen of the lnitcd States, ,residing at Baltimore city and State of lll'aryland, have intt-nted certain new and useful llmpiove-v ments in llipeouplings, ot which the following is ay specification;

This invention has relation to ppecoup ling-s. and ha@` for its object the proijision of a novel method and means for forming aA lead seal around the joint of the coupl 4d; members or sections whereby a perfecteei lis obtained in the liist instance upon the ap',- pliration ot' the molten lead to the exterior of the joint and whereby the seal is maintained in a gas tight and liquid tight coudi tion under all contingencies of expansion -and contraction.

The coupling to which my invention is particularly applicable is of the type referably employed for pipes conducting uids under high pressure and which may comprise tivo faut-et like members with an interposed coupling; thimble or sleeve,'0r one lauret 'member and a spigot member, the spigot: and faucet.. or entering and receivingportions in each instance being' tapered.

ln carrying' my invent-ion into effect and adapting; and applying the lead .seal to a coupling. as for instance toga coupling having' two faucet portions or members and an interposed sleeve or tbimble, I so rab'bet the opposing),- faces of the coupling.: angifea,l and so recess the outer surface ot' the `thimhle that the lea-.d poured over and, around thc joint 'and between the opposing su1' fares of the flanges will, on cooling', not only hermetirallj' seal the joint but will become interlocled with or anchored to the two .faucet flanges and tliiinblc and form a Wedge litre packing in such a Way that when the pipe sectionsI tend to separate underexpansion the lead packingr vwill be caused to as- .euine a corresponding and .'compensatingr forni. lso that il the seam between the. lead and iron widens at one or more points it will close at other points and thus always preserve the hermetic quality of the seal.

In the accompanying drawings: Figure 1 is al longitudinal sectional View of a pair ot coupledfaucet.ended pipes with interposed ^thiinhlehaifing the joint sealed according to my invention. Fig. 2 is a transverse ser tional View ot the sanieon the line -X 'of Fig. l. Fig. 3 is a longitudinal ser-tional View of ar pair of coupled pi s, one harina a spigot end and the other a faucet end, hav ing the sealed joint of my invention. l Fig. el is a longitudinal.section on an enlarged scale oi a pair ot coupled lead filling omitted.

lteferi'ing to Fig. l, l and 2 deeignate the pipe lengths and 25 andv Al reepectively the faucet ende thereof, both faucets being; alike and formed with the coupling langesw haring lugs t3,-piereed at T 'for the passage of bolts, and it' desired, formed with under (iut lgrooves ,`o1ij.^tlieir outer faces for the engagementot' the 'clamps t). The mouths ot' vthe flanges or vfaucety ends are interiorly '70 tapered as shown at 9 and foi-in seats or sockets for the reception ot' the tapered ends ot' the sleeve or thimble 1U. j l

The faucets are preferably designed to have a certain'amount ot' elasticity and tor 'this 75 purpose are recessed annularly ori-their 1nterior surfaces haelt ot' the tapered sockets or seats 9. as shown at 11. The ends ot the coupling thimble l0 extend far enough baril:

in the pipesvllo almost cover the recesses l1, so as to maintain as far as practicable the even continuit-y of the bores' of the pipes, re-` i;

dure frictional obstruction 'and prevent the at 13 to render the tl'iimb'lesomewhat elaetic= at the middle point -and accommodate itself to tlexure and strain.

The inner and opposing acesof the faucet flanges are rabbeted at lLl. 14 on converging lineel b v which supplementary flanges 15. 15 are jiii'oduced. the upper surfaces 16,'16 95 of the latter being;r slightly undercut or dove tailed. and their it'acial sin-tacos 17, i7 made convergent towards earh other in a radial direction and coincident with the sides 0.15 the groove 12 1u the outlet surface of the lilo thimble l0., When the pipes are coupled tof gather, an annular space is lett between the faucet flanges, such space being generally of a wedge shape by reason of tbe converpipes. with part of the 6ov nenne ot' the surfaces lei- 14. `l7-l7. and the sideel ot the thiinble groove llhen the pipes are coupled together and the molten lead poured between the faucet' llanges and around the joint. the shrii'ikafzo ot' tht` lead on rooling causesit. to contract 119. ratluillfiY and to exert a tight hold on the l ihinihliit). The contraction ot the lead is l also lateral and of such a character as to i usual method of casting lead seals by form- .10

`e/xert contractile force against the undercut surfaces of the supplementary flanges 15, and

.as such force is lateral, that is in the direction of the axis of the pipes, the latter will be drawn towards each other and the joints tightened.

' 4In forming the lead seal according to the ing a dam around the joint, its outer surface will assume a concave form 1n a lateral direction and the mass will be comparatively thin at Cpoints subject to strain under expansion contraction of .the joints, and will therefore flex or bend according to the direction in which strain takes place as the pipes tend Y' to separate, come together, or depart from axial alinement.. Normally, as when the'plpes .ihimble l0 is dispensed With, and one of the viv"pipes or vjoint members formed with a spigot .18the projecting portion of which is similar are f'rst cou ledand the lead seal applied, the hitter Wi l exertthe same pressure 1n 'all directions against the surfaces with which it is ^in contact. If, afterwards, the pipes .should tend to separate axially, they will meet resistance at the points 16-16, and such separating tendency will "be thus counterj acted'to the extent of preventing any opento a correspondin portion of the thimble. In other respects t 1e structure sho wn in Fig. 3 isthe same as that shown inv Figs. l and 4, the last named being an enlarged view'of the coupling shown in Fig. 1, With apart of the lea 1.

seal removed to distinctly show the anchoring recess.

Having described my invention, I claim: 1. The method of forming hermetic seals in flanged pipe couplings, which consists in providing theflanges ou their. outer faces with undercut annular recesses and casting molten lmetal around the joint and solely between said flanges so as to fill said recesses I and draw the coupling members together.

2. The method of sealing" flanged pipe couplings, consisting in forming annular, undercut and converging walled recesses in the outer faces of theflanges, and casting molten metal around' the joint and solely between said flanges so as to fill the recesses E each other- A 3. The method of' sealing flanged pipe couplings of the spigot and faucet type, consisting in forming annular undercut anchoring recesses in the outer faces of the flanges, casting molten metal around the joint and solely between the flanges and thereby anchoring the resultant seal on the flanges.

4. rIhe method of sealing flanged pipe couplings which consists in recessing the lfaces of' the flanges, casting a molten metal seal around the joint and solely between said flanges and into said recesses and thereby anchoring the seal vto the coupled members.

5. In pipe couplings, the combination with the coupling flanges having undercut -anchoring rrecesses forming supplementary ,flanges on their outer faces, oft' a soft metal seal surrounding the joint solely between the flanges and anchored to said coupling flanges.

6. :In pipe couplings, the combination with coupling flanges having their outer surfaces formed witlrconverging walls, and the latter rabbeted,-of` an annularly grooved coupling spigot and a lead packing surrounding the joint and interlocked with the flan-ges and engaging the spigot. s 7. A pipe coupling comprising two flanged tubular members formed with annular seal anchoring recesses, a tubular spigot which enters the flanged members and is circ'umf'erentially grooved and a lead seal which surrounds the joint and which is anchored to the flange and fills the groove in the spigot.

and draw the coupling members towards l8. A pipe coupling comprising two eir' cumferentmlly flanged tubular members one" of which is a faucet, a. spigot :md a lead seal surrounding the joint between the coupled members, and positively engaging the flanges and spigot, said flanges and said spigot being fori-ned with anchoring recesses for the seal.

9. The .method of' connecting flanged pipe couplings, consisting in forming the flanges with anchorihgrecesses, bolting the flanges together. casting molten metal around the joint into said recesses and solely between the opposing faces ofl said flanges and interlocking the poured nieta] with the coupling members.

in presence of two witnesses.

CHARLES R. SCHMIDT. Witnesses:A

Tnos. A. 'CoNNoLLY, J os. B. CONNOLLY.

In testimony whereof I affix my signature, 

